using System; using System.Diagnostics; #if NETCOREAPP3_0_OR_GREATER using System.Runtime.CompilerServices; using System.Runtime.InteropServices; using System.Runtime.Intrinsics; using System.Runtime.Intrinsics.X86; #endif using Org.BouncyCastle.Crypto.Utilities; namespace Org.BouncyCastle.Math.Raw { internal static class Nat256 { private const ulong M = 0xFFFFFFFFUL; public static uint Add(uint[] x, uint[] y, uint[] z) { ulong c = 0; c += (ulong)x[0] + y[0]; z[0] = (uint)c; c >>= 32; c += (ulong)x[1] + y[1]; z[1] = (uint)c; c >>= 32; c += (ulong)x[2] + y[2]; z[2] = (uint)c; c >>= 32; c += (ulong)x[3] + y[3]; z[3] = (uint)c; c >>= 32; c += (ulong)x[4] + y[4]; z[4] = (uint)c; c >>= 32; c += (ulong)x[5] + y[5]; z[5] = (uint)c; c >>= 32; c += (ulong)x[6] + y[6]; z[6] = (uint)c; c >>= 32; c += (ulong)x[7] + y[7]; z[7] = (uint)c; c >>= 32; return (uint)c; } public static uint Add(uint[] x, int xOff, uint[] y, int yOff, uint[] z, int zOff) { ulong c = 0; c += (ulong)x[xOff + 0] + y[yOff + 0]; z[zOff + 0] = (uint)c; c >>= 32; c += (ulong)x[xOff + 1] + y[yOff + 1]; z[zOff + 1] = (uint)c; c >>= 32; c += (ulong)x[xOff + 2] + y[yOff + 2]; z[zOff + 2] = (uint)c; c >>= 32; c += (ulong)x[xOff + 3] + y[yOff + 3]; z[zOff + 3] = (uint)c; c >>= 32; c += (ulong)x[xOff + 4] + y[yOff + 4]; z[zOff + 4] = (uint)c; c >>= 32; c += (ulong)x[xOff + 5] + y[yOff + 5]; z[zOff + 5] = (uint)c; c >>= 32; c += (ulong)x[xOff + 6] + y[yOff + 6]; z[zOff + 6] = (uint)c; c >>= 32; c += (ulong)x[xOff + 7] + y[yOff + 7]; z[zOff + 7] = (uint)c; c >>= 32; return (uint)c; } public static uint AddBothTo(uint[] x, uint[] y, uint[] z) { ulong c = 0; c += (ulong)x[0] + y[0] + z[0]; z[0] = (uint)c; c >>= 32; c += (ulong)x[1] + y[1] + z[1]; z[1] = (uint)c; c >>= 32; c += (ulong)x[2] + y[2] + z[2]; z[2] = (uint)c; c >>= 32; c += (ulong)x[3] + y[3] + z[3]; z[3] = (uint)c; c >>= 32; c += (ulong)x[4] + y[4] + z[4]; z[4] = (uint)c; c >>= 32; c += (ulong)x[5] + y[5] + z[5]; z[5] = (uint)c; c >>= 32; c += (ulong)x[6] + y[6] + z[6]; z[6] = (uint)c; c >>= 32; c += (ulong)x[7] + y[7] + z[7]; z[7] = (uint)c; c >>= 32; return (uint)c; } public static uint AddBothTo(uint[] x, int xOff, uint[] y, int yOff, uint[] z, int zOff) { ulong c = 0; c += (ulong)x[xOff + 0] + y[yOff + 0] + z[zOff + 0]; z[zOff + 0] = (uint)c; c >>= 32; c += (ulong)x[xOff + 1] + y[yOff + 1] + z[zOff + 1]; z[zOff + 1] = (uint)c; c >>= 32; c += (ulong)x[xOff + 2] + y[yOff + 2] + z[zOff + 2]; z[zOff + 2] = (uint)c; c >>= 32; c += (ulong)x[xOff + 3] + y[yOff + 3] + z[zOff + 3]; z[zOff + 3] = (uint)c; c >>= 32; c += (ulong)x[xOff + 4] + y[yOff + 4] + z[zOff + 4]; z[zOff + 4] = (uint)c; c >>= 32; c += (ulong)x[xOff + 5] + y[yOff + 5] + z[zOff + 5]; z[zOff + 5] = (uint)c; c >>= 32; c += (ulong)x[xOff + 6] + y[yOff + 6] + z[zOff + 6]; z[zOff + 6] = (uint)c; c >>= 32; c += (ulong)x[xOff + 7] + y[yOff + 7] + z[zOff + 7]; z[zOff + 7] = (uint)c; c >>= 32; return (uint)c; } public static uint AddTo(uint[] x, uint[] z, uint cIn) { ulong c = cIn; c += (ulong)x[0] + z[0]; z[0] = (uint)c; c >>= 32; c += (ulong)x[1] + z[1]; z[1] = (uint)c; c >>= 32; c += (ulong)x[2] + z[2]; z[2] = (uint)c; c >>= 32; c += (ulong)x[3] + z[3]; z[3] = (uint)c; c >>= 32; c += (ulong)x[4] + z[4]; z[4] = (uint)c; c >>= 32; c += (ulong)x[5] + z[5]; z[5] = (uint)c; c >>= 32; c += (ulong)x[6] + z[6]; z[6] = (uint)c; c >>= 32; c += (ulong)x[7] + z[7]; z[7] = (uint)c; c >>= 32; return (uint)c; } public static uint AddTo(uint[] x, int xOff, uint[] z, int zOff, uint cIn) { ulong c = cIn; c += (ulong)x[xOff + 0] + z[zOff + 0]; z[zOff + 0] = (uint)c; c >>= 32; c += (ulong)x[xOff + 1] + z[zOff + 1]; z[zOff + 1] = (uint)c; c >>= 32; c += (ulong)x[xOff + 2] + z[zOff + 2]; z[zOff + 2] = (uint)c; c >>= 32; c += (ulong)x[xOff + 3] + z[zOff + 3]; z[zOff + 3] = (uint)c; c >>= 32; c += (ulong)x[xOff + 4] + z[zOff + 4]; z[zOff + 4] = (uint)c; c >>= 32; c += (ulong)x[xOff + 5] + z[zOff + 5]; z[zOff + 5] = (uint)c; c >>= 32; c += (ulong)x[xOff + 6] + z[zOff + 6]; z[zOff + 6] = (uint)c; c >>= 32; c += (ulong)x[xOff + 7] + z[zOff + 7]; z[zOff + 7] = (uint)c; c >>= 32; return (uint)c; } #if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER public static uint AddTo(ReadOnlySpan x, Span z, uint cIn) { ulong c = cIn; c += (ulong)x[0] + z[0]; z[0] = (uint)c; c >>= 32; c += (ulong)x[1] + z[1]; z[1] = (uint)c; c >>= 32; c += (ulong)x[2] + z[2]; z[2] = (uint)c; c >>= 32; c += (ulong)x[3] + z[3]; z[3] = (uint)c; c >>= 32; c += (ulong)x[4] + z[4]; z[4] = (uint)c; c >>= 32; c += (ulong)x[5] + z[5]; z[5] = (uint)c; c >>= 32; c += (ulong)x[6] + z[6]; z[6] = (uint)c; c >>= 32; c += (ulong)x[7] + z[7]; z[7] = (uint)c; c >>= 32; return (uint)c; } #endif public static uint AddToEachOther(uint[] u, int uOff, uint[] v, int vOff) { ulong c = 0; c += (ulong)u[uOff + 0] + v[vOff + 0]; u[uOff + 0] = (uint)c; v[vOff + 0] = (uint)c; c >>= 32; c += (ulong)u[uOff + 1] + v[vOff + 1]; u[uOff + 1] = (uint)c; v[vOff + 1] = (uint)c; c >>= 32; c += (ulong)u[uOff + 2] + v[vOff + 2]; u[uOff + 2] = (uint)c; v[vOff + 2] = (uint)c; c >>= 32; c += (ulong)u[uOff + 3] + v[vOff + 3]; u[uOff + 3] = (uint)c; v[vOff + 3] = (uint)c; c >>= 32; c += (ulong)u[uOff + 4] + v[vOff + 4]; u[uOff + 4] = (uint)c; v[vOff + 4] = (uint)c; c >>= 32; c += (ulong)u[uOff + 5] + v[vOff + 5]; u[uOff + 5] = (uint)c; v[vOff + 5] = (uint)c; c >>= 32; c += (ulong)u[uOff + 6] + v[vOff + 6]; u[uOff + 6] = (uint)c; v[vOff + 6] = (uint)c; c >>= 32; c += (ulong)u[uOff + 7] + v[vOff + 7]; u[uOff + 7] = (uint)c; v[vOff + 7] = (uint)c; c >>= 32; return (uint)c; } public static void Copy(uint[] x, uint[] z) { z[0] = x[0]; z[1] = x[1]; z[2] = x[2]; z[3] = x[3]; z[4] = x[4]; z[5] = x[5]; z[6] = x[6]; z[7] = x[7]; } public static void Copy(uint[] x, int xOff, uint[] z, int zOff) { z[zOff + 0] = x[xOff + 0]; z[zOff + 1] = x[xOff + 1]; z[zOff + 2] = x[xOff + 2]; z[zOff + 3] = x[xOff + 3]; z[zOff + 4] = x[xOff + 4]; z[zOff + 5] = x[xOff + 5]; z[zOff + 6] = x[xOff + 6]; z[zOff + 7] = x[xOff + 7]; } public static void Copy64(ulong[] x, ulong[] z) { z[0] = x[0]; z[1] = x[1]; z[2] = x[2]; z[3] = x[3]; } public static void Copy64(ulong[] x, int xOff, ulong[] z, int zOff) { z[zOff + 0] = x[xOff + 0]; z[zOff + 1] = x[xOff + 1]; z[zOff + 2] = x[xOff + 2]; z[zOff + 3] = x[xOff + 3]; } #if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER public static void Copy64(ReadOnlySpan x, Span z) { z[0] = x[0]; z[1] = x[1]; z[2] = x[2]; z[3] = x[3]; } #endif public static uint[] Create() { return new uint[8]; } public static ulong[] Create64() { return new ulong[4]; } public static uint[] CreateExt() { return new uint[16]; } public static ulong[] CreateExt64() { return new ulong[8]; } public static bool Diff(uint[] x, int xOff, uint[] y, int yOff, uint[] z, int zOff) { bool pos = Gte(x, xOff, y, yOff); if (pos) { Sub(x, xOff, y, yOff, z, zOff); } else { Sub(y, yOff, x, xOff, z, zOff); } return pos; } public static bool Eq(uint[] x, uint[] y) { for (int i = 7; i >= 0; --i) { if (x[i] != y[i]) return false; } return true; } public static bool Eq64(ulong[] x, ulong[] y) { for (int i = 3; i >= 0; --i) { if (x[i] != y[i]) { return false; } } return true; } public static uint GetBit(uint[] x, int bit) { if (bit == 0) { return x[0] & 1; } if ((bit & 255) != bit) { return 0; } int w = bit >> 5; int b = bit & 31; return (x[w] >> b) & 1; } public static bool Gte(uint[] x, uint[] y) { for (int i = 7; i >= 0; --i) { uint x_i = x[i], y_i = y[i]; if (x_i < y_i) return false; if (x_i > y_i) return true; } return true; } public static bool Gte(uint[] x, int xOff, uint[] y, int yOff) { for (int i = 7; i >= 0; --i) { uint x_i = x[xOff + i], y_i = y[yOff + i]; if (x_i < y_i) return false; if (x_i > y_i) return true; } return true; } #if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER public static bool Gte(ReadOnlySpan x, ReadOnlySpan y) { for (int i = 7; i >= 0; --i) { uint x_i = x[i], y_i = y[i]; if (x_i < y_i) return false; if (x_i > y_i) return true; } return true; } #endif public static bool IsOne(uint[] x) { if (x[0] != 1) { return false; } for (int i = 1; i < 8; ++i) { if (x[i] != 0) { return false; } } return true; } public static bool IsOne64(ulong[] x) { if (x[0] != 1UL) { return false; } for (int i = 1; i < 4; ++i) { if (x[i] != 0UL) { return false; } } return true; } #if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER public static bool IsZero(ReadOnlySpan x) #else public static bool IsZero(uint[] x) #endif { for (int i = 0; i < 8; ++i) { if (x[i] != 0) return false; } return true; } #if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER public static bool IsZero64(ReadOnlySpan x) #else public static bool IsZero64(ulong[] x) #endif { for (int i = 0; i < 4; ++i) { if (x[i] != 0UL) return false; } return true; } public static void Mul(uint[] x, uint[] y, uint[] zz) { ulong y_0 = y[0]; ulong y_1 = y[1]; ulong y_2 = y[2]; ulong y_3 = y[3]; ulong y_4 = y[4]; ulong y_5 = y[5]; ulong y_6 = y[6]; ulong y_7 = y[7]; { ulong c = 0, x_0 = x[0]; c += x_0 * y_0; zz[0] = (uint)c; c >>= 32; c += x_0 * y_1; zz[1] = (uint)c; c >>= 32; c += x_0 * y_2; zz[2] = (uint)c; c >>= 32; c += x_0 * y_3; zz[3] = (uint)c; c >>= 32; c += x_0 * y_4; zz[4] = (uint)c; c >>= 32; c += x_0 * y_5; zz[5] = (uint)c; c >>= 32; c += x_0 * y_6; zz[6] = (uint)c; c >>= 32; c += x_0 * y_7; zz[7] = (uint)c; c >>= 32; zz[8] = (uint)c; } for (int i = 1; i < 8; ++i) { ulong c = 0, x_i = x[i]; c += x_i * y_0 + zz[i + 0]; zz[i + 0] = (uint)c; c >>= 32; c += x_i * y_1 + zz[i + 1]; zz[i + 1] = (uint)c; c >>= 32; c += x_i * y_2 + zz[i + 2]; zz[i + 2] = (uint)c; c >>= 32; c += x_i * y_3 + zz[i + 3]; zz[i + 3] = (uint)c; c >>= 32; c += x_i * y_4 + zz[i + 4]; zz[i + 4] = (uint)c; c >>= 32; c += x_i * y_5 + zz[i + 5]; zz[i + 5] = (uint)c; c >>= 32; c += x_i * y_6 + zz[i + 6]; zz[i + 6] = (uint)c; c >>= 32; c += x_i * y_7 + zz[i + 7]; zz[i + 7] = (uint)c; c >>= 32; zz[i + 8] = (uint)c; } } public static void Mul(uint[] x, int xOff, uint[] y, int yOff, uint[] zz, int zzOff) { ulong y_0 = y[yOff + 0]; ulong y_1 = y[yOff + 1]; ulong y_2 = y[yOff + 2]; ulong y_3 = y[yOff + 3]; ulong y_4 = y[yOff + 4]; ulong y_5 = y[yOff + 5]; ulong y_6 = y[yOff + 6]; ulong y_7 = y[yOff + 7]; { ulong c = 0, x_0 = x[xOff + 0]; c += x_0 * y_0; zz[zzOff + 0] = (uint)c; c >>= 32; c += x_0 * y_1; zz[zzOff + 1] = (uint)c; c >>= 32; c += x_0 * y_2; zz[zzOff + 2] = (uint)c; c >>= 32; c += x_0 * y_3; zz[zzOff + 3] = (uint)c; c >>= 32; c += x_0 * y_4; zz[zzOff + 4] = (uint)c; c >>= 32; c += x_0 * y_5; zz[zzOff + 5] = (uint)c; c >>= 32; c += x_0 * y_6; zz[zzOff + 6] = (uint)c; c >>= 32; c += x_0 * y_7; zz[zzOff + 7] = (uint)c; c >>= 32; zz[zzOff + 8] = (uint)c; } for (int i = 1; i < 8; ++i) { ++zzOff; ulong c = 0, x_i = x[xOff + i]; c += x_i * y_0 + zz[zzOff + 0]; zz[zzOff + 0] = (uint)c; c >>= 32; c += x_i * y_1 + zz[zzOff + 1]; zz[zzOff + 1] = (uint)c; c >>= 32; c += x_i * y_2 + zz[zzOff + 2]; zz[zzOff + 2] = (uint)c; c >>= 32; c += x_i * y_3 + zz[zzOff + 3]; zz[zzOff + 3] = (uint)c; c >>= 32; c += x_i * y_4 + zz[zzOff + 4]; zz[zzOff + 4] = (uint)c; c >>= 32; c += x_i * y_5 + zz[zzOff + 5]; zz[zzOff + 5] = (uint)c; c >>= 32; c += x_i * y_6 + zz[zzOff + 6]; zz[zzOff + 6] = (uint)c; c >>= 32; c += x_i * y_7 + zz[zzOff + 7]; zz[zzOff + 7] = (uint)c; c >>= 32; zz[zzOff + 8] = (uint)c; } } #if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER public static void Mul(ReadOnlySpan x, ReadOnlySpan y, Span zz) { ulong y_0 = y[0]; ulong y_1 = y[1]; ulong y_2 = y[2]; ulong y_3 = y[3]; ulong y_4 = y[4]; ulong y_5 = y[5]; ulong y_6 = y[6]; ulong y_7 = y[7]; { ulong c = 0, x_0 = x[0]; c += x_0 * y_0; zz[0] = (uint)c; c >>= 32; c += x_0 * y_1; zz[1] = (uint)c; c >>= 32; c += x_0 * y_2; zz[2] = (uint)c; c >>= 32; c += x_0 * y_3; zz[3] = (uint)c; c >>= 32; c += x_0 * y_4; zz[4] = (uint)c; c >>= 32; c += x_0 * y_5; zz[5] = (uint)c; c >>= 32; c += x_0 * y_6; zz[6] = (uint)c; c >>= 32; c += x_0 * y_7; zz[7] = (uint)c; c >>= 32; zz[8] = (uint)c; } for (int i = 1; i < 8; ++i) { ulong c = 0, x_i = x[i]; c += x_i * y_0 + zz[i + 0]; zz[i + 0] = (uint)c; c >>= 32; c += x_i * y_1 + zz[i + 1]; zz[i + 1] = (uint)c; c >>= 32; c += x_i * y_2 + zz[i + 2]; zz[i + 2] = (uint)c; c >>= 32; c += x_i * y_3 + zz[i + 3]; zz[i + 3] = (uint)c; c >>= 32; c += x_i * y_4 + zz[i + 4]; zz[i + 4] = (uint)c; c >>= 32; c += x_i * y_5 + zz[i + 5]; zz[i + 5] = (uint)c; c >>= 32; c += x_i * y_6 + zz[i + 6]; zz[i + 6] = (uint)c; c >>= 32; c += x_i * y_7 + zz[i + 7]; zz[i + 7] = (uint)c; c >>= 32; zz[i + 8] = (uint)c; } } #endif public static void Mul128(uint[] x, uint[] y128, uint[] zz) { ulong x_0 = x[0]; ulong x_1 = x[1]; ulong x_2 = x[2]; ulong x_3 = x[3]; ulong x_4 = x[4]; ulong x_5 = x[5]; ulong x_6 = x[6]; ulong x_7 = x[7]; { ulong c = 0, y_0 = y128[0]; c += y_0 * x_0; zz[0] = (uint)c; c >>= 32; c += y_0 * x_1; zz[1] = (uint)c; c >>= 32; c += y_0 * x_2; zz[2] = (uint)c; c >>= 32; c += y_0 * x_3; zz[3] = (uint)c; c >>= 32; c += y_0 * x_4; zz[4] = (uint)c; c >>= 32; c += y_0 * x_5; zz[5] = (uint)c; c >>= 32; c += y_0 * x_6; zz[6] = (uint)c; c >>= 32; c += y_0 * x_7; zz[7] = (uint)c; c >>= 32; zz[8] = (uint)c; } for (int i = 1; i < 4; ++i) { ulong c = 0, y_i = y128[i]; c += y_i * x_0 + zz[i + 0]; zz[i + 0] = (uint)c; c >>= 32; c += y_i * x_1 + zz[i + 1]; zz[i + 1] = (uint)c; c >>= 32; c += y_i * x_2 + zz[i + 2]; zz[i + 2] = (uint)c; c >>= 32; c += y_i * x_3 + zz[i + 3]; zz[i + 3] = (uint)c; c >>= 32; c += y_i * x_4 + zz[i + 4]; zz[i + 4] = (uint)c; c >>= 32; c += y_i * x_5 + zz[i + 5]; zz[i + 5] = (uint)c; c >>= 32; c += y_i * x_6 + zz[i + 6]; zz[i + 6] = (uint)c; c >>= 32; c += y_i * x_7 + zz[i + 7]; zz[i + 7] = (uint)c; c >>= 32; zz[i + 8] = (uint)c; } } #if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER public static void Mul128(ReadOnlySpan x, ReadOnlySpan y128, Span zz) { ulong x_0 = x[0]; ulong x_1 = x[1]; ulong x_2 = x[2]; ulong x_3 = x[3]; ulong x_4 = x[4]; ulong x_5 = x[5]; ulong x_6 = x[6]; ulong x_7 = x[7]; { ulong c = 0, y_0 = y128[0]; c += y_0 * x_0; zz[0] = (uint)c; c >>= 32; c += y_0 * x_1; zz[1] = (uint)c; c >>= 32; c += y_0 * x_2; zz[2] = (uint)c; c >>= 32; c += y_0 * x_3; zz[3] = (uint)c; c >>= 32; c += y_0 * x_4; zz[4] = (uint)c; c >>= 32; c += y_0 * x_5; zz[5] = (uint)c; c >>= 32; c += y_0 * x_6; zz[6] = (uint)c; c >>= 32; c += y_0 * x_7; zz[7] = (uint)c; c >>= 32; zz[8] = (uint)c; } for (int i = 1; i < 4; ++i) { ulong c = 0, y_i = y128[i]; c += y_i * x_0 + zz[i + 0]; zz[i + 0] = (uint)c; c >>= 32; c += y_i * x_1 + zz[i + 1]; zz[i + 1] = (uint)c; c >>= 32; c += y_i * x_2 + zz[i + 2]; zz[i + 2] = (uint)c; c >>= 32; c += y_i * x_3 + zz[i + 3]; zz[i + 3] = (uint)c; c >>= 32; c += y_i * x_4 + zz[i + 4]; zz[i + 4] = (uint)c; c >>= 32; c += y_i * x_5 + zz[i + 5]; zz[i + 5] = (uint)c; c >>= 32; c += y_i * x_6 + zz[i + 6]; zz[i + 6] = (uint)c; c >>= 32; c += y_i * x_7 + zz[i + 7]; zz[i + 7] = (uint)c; c >>= 32; zz[i + 8] = (uint)c; } } #endif public static uint MulAddTo(uint[] x, uint[] y, uint[] zz) { ulong y_0 = y[0]; ulong y_1 = y[1]; ulong y_2 = y[2]; ulong y_3 = y[3]; ulong y_4 = y[4]; ulong y_5 = y[5]; ulong y_6 = y[6]; ulong y_7 = y[7]; ulong zc = 0; for (int i = 0; i < 8; ++i) { ulong c = 0, x_i = x[i]; c += x_i * y_0 + zz[i + 0]; zz[i + 0] = (uint)c; c >>= 32; c += x_i * y_1 + zz[i + 1]; zz[i + 1] = (uint)c; c >>= 32; c += x_i * y_2 + zz[i + 2]; zz[i + 2] = (uint)c; c >>= 32; c += x_i * y_3 + zz[i + 3]; zz[i + 3] = (uint)c; c >>= 32; c += x_i * y_4 + zz[i + 4]; zz[i + 4] = (uint)c; c >>= 32; c += x_i * y_5 + zz[i + 5]; zz[i + 5] = (uint)c; c >>= 32; c += x_i * y_6 + zz[i + 6]; zz[i + 6] = (uint)c; c >>= 32; c += x_i * y_7 + zz[i + 7]; zz[i + 7] = (uint)c; c >>= 32; zc += c + zz[i + 8]; zz[i + 8] = (uint)zc; zc >>= 32; } return (uint)zc; } public static uint MulAddTo(uint[] x, int xOff, uint[] y, int yOff, uint[] zz, int zzOff) { ulong y_0 = y[yOff + 0]; ulong y_1 = y[yOff + 1]; ulong y_2 = y[yOff + 2]; ulong y_3 = y[yOff + 3]; ulong y_4 = y[yOff + 4]; ulong y_5 = y[yOff + 5]; ulong y_6 = y[yOff + 6]; ulong y_7 = y[yOff + 7]; ulong zc = 0; for (int i = 0; i < 8; ++i) { ulong c = 0, x_i = x[xOff + i]; c += x_i * y_0 + zz[zzOff + 0]; zz[zzOff + 0] = (uint)c; c >>= 32; c += x_i * y_1 + zz[zzOff + 1]; zz[zzOff + 1] = (uint)c; c >>= 32; c += x_i * y_2 + zz[zzOff + 2]; zz[zzOff + 2] = (uint)c; c >>= 32; c += x_i * y_3 + zz[zzOff + 3]; zz[zzOff + 3] = (uint)c; c >>= 32; c += x_i * y_4 + zz[zzOff + 4]; zz[zzOff + 4] = (uint)c; c >>= 32; c += x_i * y_5 + zz[zzOff + 5]; zz[zzOff + 5] = (uint)c; c >>= 32; c += x_i * y_6 + zz[zzOff + 6]; zz[zzOff + 6] = (uint)c; c >>= 32; c += x_i * y_7 + zz[zzOff + 7]; zz[zzOff + 7] = (uint)c; c >>= 32; zc += c + zz[zzOff + 8]; zz[zzOff + 8] = (uint)zc; zc >>= 32; ++zzOff; } return (uint)zc; } public static ulong Mul33Add(uint w, uint[] x, int xOff, uint[] y, int yOff, uint[] z, int zOff) { Debug.Assert(w >> 31 == 0); ulong c = 0, wVal = w; ulong x0 = x[xOff + 0]; c += wVal * x0 + y[yOff + 0]; z[zOff + 0] = (uint)c; c >>= 32; ulong x1 = x[xOff + 1]; c += wVal * x1 + x0 + y[yOff + 1]; z[zOff + 1] = (uint)c; c >>= 32; ulong x2 = x[xOff + 2]; c += wVal * x2 + x1 + y[yOff + 2]; z[zOff + 2] = (uint)c; c >>= 32; ulong x3 = x[xOff + 3]; c += wVal * x3 + x2 + y[yOff + 3]; z[zOff + 3] = (uint)c; c >>= 32; ulong x4 = x[xOff + 4]; c += wVal * x4 + x3 + y[yOff + 4]; z[zOff + 4] = (uint)c; c >>= 32; ulong x5 = x[xOff + 5]; c += wVal * x5 + x4 + y[yOff + 5]; z[zOff + 5] = (uint)c; c >>= 32; ulong x6 = x[xOff + 6]; c += wVal * x6 + x5 + y[yOff + 6]; z[zOff + 6] = (uint)c; c >>= 32; ulong x7 = x[xOff + 7]; c += wVal * x7 + x6 + y[yOff + 7]; z[zOff + 7] = (uint)c; c >>= 32; c += x7; return c; } public static uint MulByWord(uint x, uint[] z) { ulong c = 0, xVal = x; c += xVal * (ulong)z[0]; z[0] = (uint)c; c >>= 32; c += xVal * (ulong)z[1]; z[1] = (uint)c; c >>= 32; c += xVal * (ulong)z[2]; z[2] = (uint)c; c >>= 32; c += xVal * (ulong)z[3]; z[3] = (uint)c; c >>= 32; c += xVal * (ulong)z[4]; z[4] = (uint)c; c >>= 32; c += xVal * (ulong)z[5]; z[5] = (uint)c; c >>= 32; c += xVal * (ulong)z[6]; z[6] = (uint)c; c >>= 32; c += xVal * (ulong)z[7]; z[7] = (uint)c; c >>= 32; return (uint)c; } public static uint MulByWordAddTo(uint x, uint[] y, uint[] z) { ulong c = 0, xVal = x; c += xVal * (ulong)z[0] + y[0]; z[0] = (uint)c; c >>= 32; c += xVal * (ulong)z[1] + y[1]; z[1] = (uint)c; c >>= 32; c += xVal * (ulong)z[2] + y[2]; z[2] = (uint)c; c >>= 32; c += xVal * (ulong)z[3] + y[3]; z[3] = (uint)c; c >>= 32; c += xVal * (ulong)z[4] + y[4]; z[4] = (uint)c; c >>= 32; c += xVal * (ulong)z[5] + y[5]; z[5] = (uint)c; c >>= 32; c += xVal * (ulong)z[6] + y[6]; z[6] = (uint)c; c >>= 32; c += xVal * (ulong)z[7] + y[7]; z[7] = (uint)c; c >>= 32; return (uint)c; } public static uint MulWordAddTo(uint x, uint[] y, int yOff, uint[] z, int zOff) { ulong c = 0, xVal = x; c += xVal * y[yOff + 0] + z[zOff + 0]; z[zOff + 0] = (uint)c; c >>= 32; c += xVal * y[yOff + 1] + z[zOff + 1]; z[zOff + 1] = (uint)c; c >>= 32; c += xVal * y[yOff + 2] + z[zOff + 2]; z[zOff + 2] = (uint)c; c >>= 32; c += xVal * y[yOff + 3] + z[zOff + 3]; z[zOff + 3] = (uint)c; c >>= 32; c += xVal * y[yOff + 4] + z[zOff + 4]; z[zOff + 4] = (uint)c; c >>= 32; c += xVal * y[yOff + 5] + z[zOff + 5]; z[zOff + 5] = (uint)c; c >>= 32; c += xVal * y[yOff + 6] + z[zOff + 6]; z[zOff + 6] = (uint)c; c >>= 32; c += xVal * y[yOff + 7] + z[zOff + 7]; z[zOff + 7] = (uint)c; c >>= 32; return (uint)c; } public static uint Mul33DWordAdd(uint x, ulong y, uint[] z, int zOff) { Debug.Assert(x >> 31 == 0); Debug.Assert(zOff <= 4); ulong c = 0, xVal = x; ulong y00 = y & M; c += xVal * y00 + z[zOff + 0]; z[zOff + 0] = (uint)c; c >>= 32; ulong y01 = y >> 32; c += xVal * y01 + y00 + z[zOff + 1]; z[zOff + 1] = (uint)c; c >>= 32; c += y01 + z[zOff + 2]; z[zOff + 2] = (uint)c; c >>= 32; c += z[zOff + 3]; z[zOff + 3] = (uint)c; c >>= 32; return c == 0 ? 0 : Nat.IncAt(8, z, zOff, 4); } public static uint Mul33WordAdd(uint x, uint y, uint[] z, int zOff) { Debug.Assert(x >> 31 == 0); Debug.Assert(zOff <= 5); ulong c = 0, yVal = y; c += yVal * x + z[zOff + 0]; z[zOff + 0] = (uint)c; c >>= 32; c += yVal + z[zOff + 1]; z[zOff + 1] = (uint)c; c >>= 32; c += z[zOff + 2]; z[zOff + 2] = (uint)c; c >>= 32; return c == 0 ? 0 : Nat.IncAt(8, z, zOff, 3); } public static uint MulWordDwordAdd(uint x, ulong y, uint[] z, int zOff) { Debug.Assert(zOff <= 5); ulong c = 0, xVal = x; c += xVal * y + z[zOff + 0]; z[zOff + 0] = (uint)c; c >>= 32; c += xVal * (y >> 32) + z[zOff + 1]; z[zOff + 1] = (uint)c; c >>= 32; c += z[zOff + 2]; z[zOff + 2] = (uint)c; c >>= 32; return c == 0 ? 0 : Nat.IncAt(8, z, zOff, 3); } public static uint MulWord(uint x, uint[] y, uint[] z, int zOff) { ulong c = 0, xVal = x; int i = 0; do { c += xVal * y[i]; z[zOff + i] = (uint)c; c >>= 32; } while (++i < 8); return (uint)c; } public static void Square(uint[] x, uint[] zz) { ulong x_0 = x[0]; ulong zz_1; uint c = 0, w; { int i = 7, j = 16; do { ulong xVal = x[i--]; ulong p = xVal * xVal; zz[--j] = (c << 31) | (uint)(p >> 33); zz[--j] = (uint)(p >> 1); c = (uint)p; } while (i > 0); { ulong p = x_0 * x_0; zz_1 = (ulong)(c << 31) | (p >> 33); zz[0] = (uint)p; c = (uint)(p >> 32) & 1; } } ulong x_1 = x[1]; ulong zz_2 = zz[2]; { zz_1 += x_1 * x_0; w = (uint)zz_1; zz[1] = (w << 1) | c; c = w >> 31; zz_2 += zz_1 >> 32; } ulong x_2 = x[2]; ulong zz_3 = zz[3]; ulong zz_4 = zz[4]; { zz_2 += x_2 * x_0; w = (uint)zz_2; zz[2] = (w << 1) | c; c = w >> 31; zz_3 += (zz_2 >> 32) + x_2 * x_1; zz_4 += zz_3 >> 32; zz_3 &= M; } ulong x_3 = x[3]; ulong zz_5 = zz[5] + (zz_4 >> 32); zz_4 &= M; ulong zz_6 = zz[6] + (zz_5 >> 32); zz_5 &= M; { zz_3 += x_3 * x_0; w = (uint)zz_3; zz[3] = (w << 1) | c; c = w >> 31; zz_4 += (zz_3 >> 32) + x_3 * x_1; zz_5 += (zz_4 >> 32) + x_3 * x_2; zz_4 &= M; zz_6 += zz_5 >> 32; zz_5 &= M; } ulong x_4 = x[4]; ulong zz_7 = zz[7] + (zz_6 >> 32); zz_6 &= M; ulong zz_8 = zz[8] + (zz_7 >> 32); zz_7 &= M; { zz_4 += x_4 * x_0; w = (uint)zz_4; zz[4] = (w << 1) | c; c = w >> 31; zz_5 += (zz_4 >> 32) + x_4 * x_1; zz_6 += (zz_5 >> 32) + x_4 * x_2; zz_5 &= M; zz_7 += (zz_6 >> 32) + x_4 * x_3; zz_6 &= M; zz_8 += zz_7 >> 32; zz_7 &= M; } ulong x_5 = x[5]; ulong zz_9 = zz[9] + (zz_8 >> 32); zz_8 &= M; ulong zz_10 = zz[10] + (zz_9 >> 32); zz_9 &= M; { zz_5 += x_5 * x_0; w = (uint)zz_5; zz[5] = (w << 1) | c; c = w >> 31; zz_6 += (zz_5 >> 32) + x_5 * x_1; zz_7 += (zz_6 >> 32) + x_5 * x_2; zz_6 &= M; zz_8 += (zz_7 >> 32) + x_5 * x_3; zz_7 &= M; zz_9 += (zz_8 >> 32) + x_5 * x_4; zz_8 &= M; zz_10 += zz_9 >> 32; zz_9 &= M; } ulong x_6 = x[6]; ulong zz_11 = zz[11] + (zz_10 >> 32); zz_10 &= M; ulong zz_12 = zz[12] + (zz_11 >> 32); zz_11 &= M; { zz_6 += x_6 * x_0; w = (uint)zz_6; zz[6] = (w << 1) | c; c = w >> 31; zz_7 += (zz_6 >> 32) + x_6 * x_1; zz_8 += (zz_7 >> 32) + x_6 * x_2; zz_7 &= M; zz_9 += (zz_8 >> 32) + x_6 * x_3; zz_8 &= M; zz_10 += (zz_9 >> 32) + x_6 * x_4; zz_9 &= M; zz_11 += (zz_10 >> 32) + x_6 * x_5; zz_10 &= M; zz_12 += zz_11 >> 32; zz_11 &= M; } ulong x_7 = x[7]; ulong zz_13 = zz[13] + (zz_12 >> 32); zz_12 &= M; ulong zz_14 = zz[14] + (zz_13 >> 32); zz_13 &= M; { zz_7 += x_7 * x_0; w = (uint)zz_7; zz[7] = (w << 1) | c; c = w >> 31; zz_8 += (zz_7 >> 32) + x_7 * x_1; zz_9 += (zz_8 >> 32) + x_7 * x_2; zz_10 += (zz_9 >> 32) + x_7 * x_3; zz_11 += (zz_10 >> 32) + x_7 * x_4; zz_12 += (zz_11 >> 32) + x_7 * x_5; zz_13 += (zz_12 >> 32) + x_7 * x_6; zz_14 += zz_13 >> 32; } w = (uint)zz_8; zz[8] = (w << 1) | c; c = w >> 31; w = (uint)zz_9; zz[9] = (w << 1) | c; c = w >> 31; w = (uint)zz_10; zz[10] = (w << 1) | c; c = w >> 31; w = (uint)zz_11; zz[11] = (w << 1) | c; c = w >> 31; w = (uint)zz_12; zz[12] = (w << 1) | c; c = w >> 31; w = (uint)zz_13; zz[13] = (w << 1) | c; c = w >> 31; w = (uint)zz_14; zz[14] = (w << 1) | c; c = w >> 31; w = zz[15] + (uint)(zz_14 >> 32); zz[15] = (w << 1) | c; } public static void Square(uint[] x, int xOff, uint[] zz, int zzOff) { ulong x_0 = x[xOff + 0]; ulong zz_1; uint c = 0, w; { int i = 7, j = 16; do { ulong xVal = x[xOff + i--]; ulong p = xVal * xVal; zz[zzOff + --j] = (c << 31) | (uint)(p >> 33); zz[zzOff + --j] = (uint)(p >> 1); c = (uint)p; } while (i > 0); { ulong p = x_0 * x_0; zz_1 = (ulong)(c << 31) | (p >> 33); zz[zzOff + 0] = (uint)p; c = (uint)(p >> 32) & 1; } } ulong x_1 = x[xOff + 1]; ulong zz_2 = zz[zzOff + 2]; { zz_1 += x_1 * x_0; w = (uint)zz_1; zz[zzOff + 1] = (w << 1) | c; c = w >> 31; zz_2 += zz_1 >> 32; } ulong x_2 = x[xOff + 2]; ulong zz_3 = zz[zzOff + 3]; ulong zz_4 = zz[zzOff + 4]; { zz_2 += x_2 * x_0; w = (uint)zz_2; zz[zzOff + 2] = (w << 1) | c; c = w >> 31; zz_3 += (zz_2 >> 32) + x_2 * x_1; zz_4 += zz_3 >> 32; zz_3 &= M; } ulong x_3 = x[xOff + 3]; ulong zz_5 = zz[zzOff + 5] + (zz_4 >> 32); zz_4 &= M; ulong zz_6 = zz[zzOff + 6] + (zz_5 >> 32); zz_5 &= M; { zz_3 += x_3 * x_0; w = (uint)zz_3; zz[zzOff + 3] = (w << 1) | c; c = w >> 31; zz_4 += (zz_3 >> 32) + x_3 * x_1; zz_5 += (zz_4 >> 32) + x_3 * x_2; zz_4 &= M; zz_6 += zz_5 >> 32; zz_5 &= M; } ulong x_4 = x[xOff + 4]; ulong zz_7 = zz[zzOff + 7] + (zz_6 >> 32); zz_6 &= M; ulong zz_8 = zz[zzOff + 8] + (zz_7 >> 32); zz_7 &= M; { zz_4 += x_4 * x_0; w = (uint)zz_4; zz[zzOff + 4] = (w << 1) | c; c = w >> 31; zz_5 += (zz_4 >> 32) + x_4 * x_1; zz_6 += (zz_5 >> 32) + x_4 * x_2; zz_5 &= M; zz_7 += (zz_6 >> 32) + x_4 * x_3; zz_6 &= M; zz_8 += zz_7 >> 32; zz_7 &= M; } ulong x_5 = x[xOff + 5]; ulong zz_9 = zz[zzOff + 9] + (zz_8 >> 32); zz_8 &= M; ulong zz_10 = zz[zzOff + 10] + (zz_9 >> 32); zz_9 &= M; { zz_5 += x_5 * x_0; w = (uint)zz_5; zz[zzOff + 5] = (w << 1) | c; c = w >> 31; zz_6 += (zz_5 >> 32) + x_5 * x_1; zz_7 += (zz_6 >> 32) + x_5 * x_2; zz_6 &= M; zz_8 += (zz_7 >> 32) + x_5 * x_3; zz_7 &= M; zz_9 += (zz_8 >> 32) + x_5 * x_4; zz_8 &= M; zz_10 += zz_9 >> 32; zz_9 &= M; } ulong x_6 = x[xOff + 6]; ulong zz_11 = zz[zzOff + 11] + (zz_10 >> 32); zz_10 &= M; ulong zz_12 = zz[zzOff + 12] + (zz_11 >> 32); zz_11 &= M; { zz_6 += x_6 * x_0; w = (uint)zz_6; zz[zzOff + 6] = (w << 1) | c; c = w >> 31; zz_7 += (zz_6 >> 32) + x_6 * x_1; zz_8 += (zz_7 >> 32) + x_6 * x_2; zz_7 &= M; zz_9 += (zz_8 >> 32) + x_6 * x_3; zz_8 &= M; zz_10 += (zz_9 >> 32) + x_6 * x_4; zz_9 &= M; zz_11 += (zz_10 >> 32) + x_6 * x_5; zz_10 &= M; zz_12 += zz_11 >> 32; zz_11 &= M; } ulong x_7 = x[xOff + 7]; ulong zz_13 = zz[zzOff + 13] + (zz_12 >> 32); zz_12 &= M; ulong zz_14 = zz[zzOff + 14] + (zz_13 >> 32); zz_13 &= M; { zz_7 += x_7 * x_0; w = (uint)zz_7; zz[zzOff + 7] = (w << 1) | c; c = w >> 31; zz_8 += (zz_7 >> 32) + x_7 * x_1; zz_9 += (zz_8 >> 32) + x_7 * x_2; zz_10 += (zz_9 >> 32) + x_7 * x_3; zz_11 += (zz_10 >> 32) + x_7 * x_4; zz_12 += (zz_11 >> 32) + x_7 * x_5; zz_13 += (zz_12 >> 32) + x_7 * x_6; zz_14 += zz_13 >> 32; } w = (uint)zz_8; zz[zzOff + 8] = (w << 1) | c; c = w >> 31; w = (uint)zz_9; zz[zzOff + 9] = (w << 1) | c; c = w >> 31; w = (uint)zz_10; zz[zzOff + 10] = (w << 1) | c; c = w >> 31; w = (uint)zz_11; zz[zzOff + 11] = (w << 1) | c; c = w >> 31; w = (uint)zz_12; zz[zzOff + 12] = (w << 1) | c; c = w >> 31; w = (uint)zz_13; zz[zzOff + 13] = (w << 1) | c; c = w >> 31; w = (uint)zz_14; zz[zzOff + 14] = (w << 1) | c; c = w >> 31; w = zz[zzOff + 15] + (uint)(zz_14 >> 32); zz[zzOff + 15] = (w << 1) | c; } #if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER public static void Square(ReadOnlySpan x, Span zz) { ulong x_0 = x[0]; ulong zz_1; uint c = 0, w; { int i = 7, j = 16; do { ulong xVal = x[i--]; ulong p = xVal * xVal; zz[--j] = (c << 31) | (uint)(p >> 33); zz[--j] = (uint)(p >> 1); c = (uint)p; } while (i > 0); { ulong p = x_0 * x_0; zz_1 = (ulong)(c << 31) | (p >> 33); zz[0] = (uint)p; c = (uint)(p >> 32) & 1; } } ulong x_1 = x[1]; ulong zz_2 = zz[2]; { zz_1 += x_1 * x_0; w = (uint)zz_1; zz[1] = (w << 1) | c; c = w >> 31; zz_2 += zz_1 >> 32; } ulong x_2 = x[2]; ulong zz_3 = zz[3]; ulong zz_4 = zz[4]; { zz_2 += x_2 * x_0; w = (uint)zz_2; zz[2] = (w << 1) | c; c = w >> 31; zz_3 += (zz_2 >> 32) + x_2 * x_1; zz_4 += zz_3 >> 32; zz_3 &= M; } ulong x_3 = x[3]; ulong zz_5 = zz[5] + (zz_4 >> 32); zz_4 &= M; ulong zz_6 = zz[6] + (zz_5 >> 32); zz_5 &= M; { zz_3 += x_3 * x_0; w = (uint)zz_3; zz[3] = (w << 1) | c; c = w >> 31; zz_4 += (zz_3 >> 32) + x_3 * x_1; zz_5 += (zz_4 >> 32) + x_3 * x_2; zz_4 &= M; zz_6 += zz_5 >> 32; zz_5 &= M; } ulong x_4 = x[4]; ulong zz_7 = zz[7] + (zz_6 >> 32); zz_6 &= M; ulong zz_8 = zz[8] + (zz_7 >> 32); zz_7 &= M; { zz_4 += x_4 * x_0; w = (uint)zz_4; zz[4] = (w << 1) | c; c = w >> 31; zz_5 += (zz_4 >> 32) + x_4 * x_1; zz_6 += (zz_5 >> 32) + x_4 * x_2; zz_5 &= M; zz_7 += (zz_6 >> 32) + x_4 * x_3; zz_6 &= M; zz_8 += zz_7 >> 32; zz_7 &= M; } ulong x_5 = x[5]; ulong zz_9 = zz[9] + (zz_8 >> 32); zz_8 &= M; ulong zz_10 = zz[10] + (zz_9 >> 32); zz_9 &= M; { zz_5 += x_5 * x_0; w = (uint)zz_5; zz[5] = (w << 1) | c; c = w >> 31; zz_6 += (zz_5 >> 32) + x_5 * x_1; zz_7 += (zz_6 >> 32) + x_5 * x_2; zz_6 &= M; zz_8 += (zz_7 >> 32) + x_5 * x_3; zz_7 &= M; zz_9 += (zz_8 >> 32) + x_5 * x_4; zz_8 &= M; zz_10 += zz_9 >> 32; zz_9 &= M; } ulong x_6 = x[6]; ulong zz_11 = zz[11] + (zz_10 >> 32); zz_10 &= M; ulong zz_12 = zz[12] + (zz_11 >> 32); zz_11 &= M; { zz_6 += x_6 * x_0; w = (uint)zz_6; zz[6] = (w << 1) | c; c = w >> 31; zz_7 += (zz_6 >> 32) + x_6 * x_1; zz_8 += (zz_7 >> 32) + x_6 * x_2; zz_7 &= M; zz_9 += (zz_8 >> 32) + x_6 * x_3; zz_8 &= M; zz_10 += (zz_9 >> 32) + x_6 * x_4; zz_9 &= M; zz_11 += (zz_10 >> 32) + x_6 * x_5; zz_10 &= M; zz_12 += zz_11 >> 32; zz_11 &= M; } ulong x_7 = x[7]; ulong zz_13 = zz[13] + (zz_12 >> 32); zz_12 &= M; ulong zz_14 = zz[14] + (zz_13 >> 32); zz_13 &= M; { zz_7 += x_7 * x_0; w = (uint)zz_7; zz[7] = (w << 1) | c; c = w >> 31; zz_8 += (zz_7 >> 32) + x_7 * x_1; zz_9 += (zz_8 >> 32) + x_7 * x_2; zz_10 += (zz_9 >> 32) + x_7 * x_3; zz_11 += (zz_10 >> 32) + x_7 * x_4; zz_12 += (zz_11 >> 32) + x_7 * x_5; zz_13 += (zz_12 >> 32) + x_7 * x_6; zz_14 += zz_13 >> 32; } w = (uint)zz_8; zz[8] = (w << 1) | c; c = w >> 31; w = (uint)zz_9; zz[9] = (w << 1) | c; c = w >> 31; w = (uint)zz_10; zz[10] = (w << 1) | c; c = w >> 31; w = (uint)zz_11; zz[11] = (w << 1) | c; c = w >> 31; w = (uint)zz_12; zz[12] = (w << 1) | c; c = w >> 31; w = (uint)zz_13; zz[13] = (w << 1) | c; c = w >> 31; w = (uint)zz_14; zz[14] = (w << 1) | c; c = w >> 31; w = zz[15] + (uint)(zz_14 >> 32); zz[15] = (w << 1) | c; } #endif public static int Sub(uint[] x, uint[] y, uint[] z) { long c = 0; c += (long)x[0] - y[0]; z[0] = (uint)c; c >>= 32; c += (long)x[1] - y[1]; z[1] = (uint)c; c >>= 32; c += (long)x[2] - y[2]; z[2] = (uint)c; c >>= 32; c += (long)x[3] - y[3]; z[3] = (uint)c; c >>= 32; c += (long)x[4] - y[4]; z[4] = (uint)c; c >>= 32; c += (long)x[5] - y[5]; z[5] = (uint)c; c >>= 32; c += (long)x[6] - y[6]; z[6] = (uint)c; c >>= 32; c += (long)x[7] - y[7]; z[7] = (uint)c; c >>= 32; return (int)c; } public static int Sub(uint[] x, int xOff, uint[] y, int yOff, uint[] z, int zOff) { long c = 0; c += (long)x[xOff + 0] - y[yOff + 0]; z[zOff + 0] = (uint)c; c >>= 32; c += (long)x[xOff + 1] - y[yOff + 1]; z[zOff + 1] = (uint)c; c >>= 32; c += (long)x[xOff + 2] - y[yOff + 2]; z[zOff + 2] = (uint)c; c >>= 32; c += (long)x[xOff + 3] - y[yOff + 3]; z[zOff + 3] = (uint)c; c >>= 32; c += (long)x[xOff + 4] - y[yOff + 4]; z[zOff + 4] = (uint)c; c >>= 32; c += (long)x[xOff + 5] - y[yOff + 5]; z[zOff + 5] = (uint)c; c >>= 32; c += (long)x[xOff + 6] - y[yOff + 6]; z[zOff + 6] = (uint)c; c >>= 32; c += (long)x[xOff + 7] - y[yOff + 7]; z[zOff + 7] = (uint)c; c >>= 32; return (int)c; } public static int SubBothFrom(uint[] x, uint[] y, uint[] z) { long c = 0; c += (long)z[0] - x[0] - y[0]; z[0] = (uint)c; c >>= 32; c += (long)z[1] - x[1] - y[1]; z[1] = (uint)c; c >>= 32; c += (long)z[2] - x[2] - y[2]; z[2] = (uint)c; c >>= 32; c += (long)z[3] - x[3] - y[3]; z[3] = (uint)c; c >>= 32; c += (long)z[4] - x[4] - y[4]; z[4] = (uint)c; c >>= 32; c += (long)z[5] - x[5] - y[5]; z[5] = (uint)c; c >>= 32; c += (long)z[6] - x[6] - y[6]; z[6] = (uint)c; c >>= 32; c += (long)z[7] - x[7] - y[7]; z[7] = (uint)c; c >>= 32; return (int)c; } public static int SubFrom(uint[] x, uint[] z, int cIn) { long c = cIn; c += (long)z[0] - x[0]; z[0] = (uint)c; c >>= 32; c += (long)z[1] - x[1]; z[1] = (uint)c; c >>= 32; c += (long)z[2] - x[2]; z[2] = (uint)c; c >>= 32; c += (long)z[3] - x[3]; z[3] = (uint)c; c >>= 32; c += (long)z[4] - x[4]; z[4] = (uint)c; c >>= 32; c += (long)z[5] - x[5]; z[5] = (uint)c; c >>= 32; c += (long)z[6] - x[6]; z[6] = (uint)c; c >>= 32; c += (long)z[7] - x[7]; z[7] = (uint)c; c >>= 32; return (int)c; } public static int SubFrom(uint[] x, int xOff, uint[] z, int zOff, int cIn) { long c = cIn; c += (long)z[zOff + 0] - x[xOff + 0]; z[zOff + 0] = (uint)c; c >>= 32; c += (long)z[zOff + 1] - x[xOff + 1]; z[zOff + 1] = (uint)c; c >>= 32; c += (long)z[zOff + 2] - x[xOff + 2]; z[zOff + 2] = (uint)c; c >>= 32; c += (long)z[zOff + 3] - x[xOff + 3]; z[zOff + 3] = (uint)c; c >>= 32; c += (long)z[zOff + 4] - x[xOff + 4]; z[zOff + 4] = (uint)c; c >>= 32; c += (long)z[zOff + 5] - x[xOff + 5]; z[zOff + 5] = (uint)c; c >>= 32; c += (long)z[zOff + 6] - x[xOff + 6]; z[zOff + 6] = (uint)c; c >>= 32; c += (long)z[zOff + 7] - x[xOff + 7]; z[zOff + 7] = (uint)c; c >>= 32; return (int)c; } #if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER public static int SubFrom(ReadOnlySpan x, Span z, int cIn) { long c = cIn; c += (long)z[0] - x[0]; z[0] = (uint)c; c >>= 32; c += (long)z[1] - x[1]; z[1] = (uint)c; c >>= 32; c += (long)z[2] - x[2]; z[2] = (uint)c; c >>= 32; c += (long)z[3] - x[3]; z[3] = (uint)c; c >>= 32; c += (long)z[4] - x[4]; z[4] = (uint)c; c >>= 32; c += (long)z[5] - x[5]; z[5] = (uint)c; c >>= 32; c += (long)z[6] - x[6]; z[6] = (uint)c; c >>= 32; c += (long)z[7] - x[7]; z[7] = (uint)c; c >>= 32; return (int)c; } #endif public static BigInteger ToBigInteger(uint[] x) { byte[] bs = new byte[32]; for (int i = 0; i < 8; ++i) { uint x_i = x[i]; if (x_i != 0) { Pack.UInt32_To_BE(x_i, bs, (7 - i) << 2); } } return new BigInteger(1, bs); } public static BigInteger ToBigInteger64(ulong[] x) { byte[] bs = new byte[32]; for (int i = 0; i < 4; ++i) { ulong x_i = x[i]; if (x_i != 0L) { Pack.UInt64_To_BE(x_i, bs, (3 - i) << 3); } } return new BigInteger(1, bs); } public static void Xor(uint[] x, int xOff, uint[] y, int yOff, uint[] z, int zOff) { #if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER Xor(x.AsSpan(xOff), y.AsSpan(yOff), z.AsSpan(zOff)); #else for (int i = 0; i < 8; i += 4) { z[zOff + i + 0] = x[xOff + i + 0] ^ y[yOff + i + 0]; z[zOff + i + 1] = x[xOff + i + 1] ^ y[yOff + i + 1]; z[zOff + i + 2] = x[xOff + i + 2] ^ y[yOff + i + 2]; z[zOff + i + 3] = x[xOff + i + 3] ^ y[yOff + i + 3]; } #endif } #if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER public static void Xor(ReadOnlySpan x, ReadOnlySpan y, Span z) { #if NETCOREAPP3_0_OR_GREATER if (Avx2.IsSupported && Unsafe.SizeOf>() == 32) { var X = MemoryMarshal.AsBytes(x[..8]); var Y = MemoryMarshal.AsBytes(y[..8]); var Z = MemoryMarshal.AsBytes(z[..8]); var X0 = MemoryMarshal.Read>(X[0x00..0x20]); var Y0 = MemoryMarshal.Read>(Y[0x00..0x20]); var Z0 = Avx2.Xor(X0, Y0); MemoryMarshal.Write(Z[0x00..0x20], ref Z0); return; } if (Sse2.IsSupported && Unsafe.SizeOf>() == 16) { var X = MemoryMarshal.AsBytes(x[..8]); var Y = MemoryMarshal.AsBytes(y[..8]); var Z = MemoryMarshal.AsBytes(z[..8]); var X0 = MemoryMarshal.Read>(X[0x00..0x10]); var X1 = MemoryMarshal.Read>(X[0x10..0x20]); var Y0 = MemoryMarshal.Read>(Y[0x00..0x10]); var Y1 = MemoryMarshal.Read>(Y[0x10..0x20]); var Z0 = Sse2.Xor(X0, Y0); var Z1 = Sse2.Xor(X1, Y1); MemoryMarshal.Write(Z[0x00..0x10], ref Z0); MemoryMarshal.Write(Z[0x10..0x20], ref Z1); return; } #endif for (int i = 0; i < 8; i += 4) { z[i + 0] = x[i + 0] ^ y[i + 0]; z[i + 1] = x[i + 1] ^ y[i + 1]; z[i + 2] = x[i + 2] ^ y[i + 2]; z[i + 3] = x[i + 3] ^ y[i + 3]; } } #endif public static void Zero(uint[] z) { z[0] = 0; z[1] = 0; z[2] = 0; z[3] = 0; z[4] = 0; z[5] = 0; z[6] = 0; z[7] = 0; } } }